body {
    position: relative;
    .top-top {
        position: fixed;
        top: 0;
        left: 0;
        height: 50px;
        width: 100%;
        box-shadow: #000 0 1px 5px;
        background-color: white;
        display: none;
        .center {
            display: flex;
            align-items: center;
            .caidan {
                width: 200px;
                height: 40px;
                background-color: #f2f2f2;
                line-height: 40px;
                margin-top: 5px;
                img {
                    margin-left: 40px;
                }
                a {
                    color: #c5c5c5;
                }
            }
            .search {
                margin-left: 164px;
                >form {
                    display: flex;
                    >div {
                        width: 62px;
                        height: 30px;
                        border: 1px solid #b20fd3;
                        text-align: center;
                        a {
                            color: #c5c5c5;
                        }
                    }
                    >input {
                        width: 340px;
                        height: 30px;
                        border-top: 1px solid #b20fd3;
                        border-bottom: 1px solid #b20fd3;
                    }
                    >button {
                        width: 92px;
                        height: 32px;
                        background-color: #b20fd3;
                        a {
                            color: white;
                            font-size: 18px;
                        }
                    }
                }
            }
        }
    }
}